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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '332dbb4fe22fc078353a7a7996052f5d313094bc0edbe0d3b8d70e58a3ca4d80' 
  AND token = 'r4uPe4rqvQU987rfu3lHznR1zitXaAKC7RwO8vzQTzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}